Program testing can be used to show the presence of bugs, but never to show their absence!
Edsger Dijkstra
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Many mathematicians derive part of their self-esteem by feeling themselves the proud heirs of a long tradition of rational thinking; I am afraid they idealize their cultural ancestors.
- Edsger Dijkstra -
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The traditional mathematician recognizes and appreciates mathematical elegance when he sees it. I propose to go one step further, and to consider elegance an essential ingredient of mathematics: if it is clumsy, it is not mathematics.
- Edsger Dijkstra